One possible plotline could be that Rouge discovers Shadow in a state of deep depression. She tries to cheer him up by taking him on adventures, showing him the beauty in the world that he's been missing. Another could be that Shadow's depression is a result of his past traumas, and Rouge, with her understanding nature, helps him face those demons. Maybe they start off as just friends, but as Rouge continues to be there for Shadow, their relationship deepens into something more romantic.
Perhaps Shadow's depression is causing him to isolate himself. Rouge, being the curious and caring character she is, doesn't let him be alone. She starts bringing him small gifts, like shiny gems she finds. These little gestures slowly break down Shadow's walls. They then embark on a journey together, with Rouge constantly supporting Shadow, and their relationship evolves as they face various challenges along the way.
A plotline could also involve Zane being in a downward spiral of depression, pushing away everyone around him including Laurence at first. But Laurence doesn't give up. He continuously tries different ways to reach Zane, like bringing him to places Zane used to love or introducing him to new hobbies. Eventually, Zane starts to open up and their relationship deepens as Zane begins to heal.
Their relationship can develop as Rouge shows empathy towards Shadow's depression. She might start by just being a listening ear. As time passes, Shadow begins to trust her more and opens up. This trust can then turn into a deeper connection, and they may start to rely on each other more.
One possible plotline could be that the maid is sent to Naruto by someone who notices his depression. The maid then tries to bring some order to Naruto's chaotic life, cooking for him, cleaning his place, and gradually, through her kindness and care, Naruto starts to open up and become less depressed.
One plot idea could be that on Halloween, Rouge discovers an ancient artifact in a spooky, abandoned castle. She enlists Shadow and Knuckles to help her figure out what it is. As they explore the castle, they encounter various traps and spooky creatures. Along the way, they start to have some friendly competitions and arguments, but also grow closer as a team.
One possible storyline could be Naruto is depressed because he feels unappreciated in the village despite all his efforts. Sakura, realizing his state, tries to cheer him up by spending more time with him. They start training together and Sakura slowly helps Naruto see his own worth through her belief in him.
A really cool storyline is when they are sent on a mission to a parallel dimension. In this dimension, their personalities are slightly different, and they have to adapt while still trying to achieve their mission goals. It's interesting to see how they interact with the alternate versions of themselves and other characters. This type of fanfiction often explores the concept of identity and how their relationship might change in different circumstances. And it can be full of action, mystery, and character development.
The theme of sacrifice could also play a part. Luffy might be willing to sacrifice his own goals or even put himself in danger to help Nami overcome her depression. Additionally, the theme of growth is likely. Nami could grow stronger emotionally as she overcomes her depression, and Luffy could grow in his understanding of complex emotions through this experience.
One common theme is the exploration of their relationship. It could be a romantic relationship or a deep friendship. Another theme is adventure, as they often go on missions together in the fanfictions. For example, in many stories, they are on a hunt for a powerful Chaos Emerald or trying to stop an evil villain.
One popular theme is the complex relationship between the shadow and rouge vampires. It could involve a love - hate relationship where they are attracted to each other yet their natures create conflict. Another theme is their struggle for power within the vampire hierarchy. And often, there is the theme of their interaction with the human world, either trying to blend in or preying on humans in different ways.
One popular storyline could be about how they deal with the challenges of impending parenthood while still being heroes. For example, they might have to balance protecting the world from villains and preparing for their baby's arrival. Another could be a story where they discover their pregnancy in the middle of an important mission and have to keep it a secret for a while. There could also be a storyline where they face opposition from their friends or society because of their relationship and the upcoming baby.